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Volume 29, Issue 10
Displaying 1-21 of 21 articles from this issue
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Shigeru Fukami1965 Volume 29 Issue 10 Pages 909-915
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSDie Untersuchung wurde mit Hilfe von Härteprüfung, röntogenographischer Analyse und Zugversuch durchgeführt. Die folgende Ergebnisse wurden ermittelt: 1. Die eutektische Legierung, die von höher Temperatur ins Wasser abgeschreckt wurde, weist eine wesentliche hohe Härte auf. Die hohe Härte der Legierung ist auf die harte Cd-haltige Phase, die im Mischkristall nicht im Gleichgewicht vorhanden ist, zurückzuführen. Die eutektische Legierung wird durch die Ausscheidung des Zn aus dem heterogenen Mischkristall erweicht. 2. Durch das Auslagern bei Zimmertemperatur nach der starke Kaltverformung nimmt die Reflexionswinkel 2θ aus den Gitterebenen, (211)cd, (203)cd und (300)cd ab und die Cd-Gitterkonstante durchschnittlich 2×10−5 Å zu. Die Zunahme der Gitterkonstante kommt von der Rekristallisation verformter Kristalle hervor. Die eutektische Cd-Zn Legierung härtet sich bei der Rekristallisation. 3. Aus dem Zugspannung-Verformung-Diagramm der Cd-Zn Legierungen ergibt sich eine Erweichung durch Kaltverformung.View full abstractDownload PDF (1190K) -
Yûnoshin Imai, Tôru Miyazaki1965 Volume 29 Issue 10 Pages 915-918
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe diffusion of radioactive silver Ag110 in single crystal silver containing alumina, prepared by internal oxidation of the silver-0.4% aluminium single crystals, has been measured over the temperature range from 750° to 900°C with the ordinary a sectioning technique. The activation energies are experimentally determined to be 45,000 cal/mol for the Ag-Al2O3 alloy and 44,400 cal/mol for pure silver. Their frequency factors are 2.95 and 1.06 cm2/sec, respectively.View full abstractDownload PDF (389K) -
Tetsuya Takaai1965 Volume 29 Issue 10 Pages 918-923
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe electron beam melting processes of molybdenum minor alloys were studied principally from the melting conditions and the spectroscopic analysis results. The electron beam melting of the molybdenum ingot with the alloying element addition was quite different from that of ingot making of pure molybdenum. That is, for example, by the melting of molybdenum ingot with 1.8 wt% zirconium addition, the frictional force between the ingot and the inner surface of the mould increased greatly during the melting, resulting in the ingot rotation and pronounced roughness of the melted ingot surface. The reason for such interruption is probably due to the coexistence of liquid and solid phases in the ingot during the melting, and it was verified that in a wider range of the coexistence temperature it becomes more difficult to make a good ingot.
The result showed that the composition of alloyed carbon decreased to about the same level of carbon in pure molybdenum. On the other hand, about 99.8∼99.9% alloyed titanium and about 95.5∼96.6% alloyed zirconium were lost during the melting. Thus measured evaporation coefficient values 1.5 and 3.0 wt% titanium in molybdenum were 44.1 and 64.0, respectively, comparable to those calculated at 3500° and 3000°K. But the measured valued of evaporation coefficient were 1.8 and 3.0 wt% zirconium in molybdenum, being about 100 and 250 times as large as the calculated values of 0.04 and 0.05.View full abstractDownload PDF (904K) -
Hirozo Kimura, Yasuo Sasaki, Sigeaki Uehara1965 Volume 29 Issue 10 Pages 924-930
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe removal process of oxygen, carbon and nitrogen from niobium metal is studied quantitatively using a laboratory-scale electron beam melting furnace. Optical microscopic observation and hardness measurement of the ingots are carried out. The removal of carbon as CO is possible in the case of crude metal containing oxygen, according to the following reaction: Nb(O)+Nb(C)→Nb+CO, and the excess oxygen is removed as NbO. The removal of oxygen as NbO proceeds at a rate about four times faster than the loss of oxygen as CO. The addition of oxygen to crude metal is nesessary to remove the excess carbon in niobium. The excess carbon is removed when oxygen is added to crude metal by oxidation. However, the addition of oxygen as niobium pentoxide to crude metal is not effective, since the oxide volatilizes abruptly in the melting process and does not cause decarburization. To obtain a high purity niobium, it is necessary to adjust the composition; the oxygen/carbon weight ratio in crude metal is desirable to be 4∼5. Nitrogen is degassed gradually during the melting process. Gross pores are observed at the interface part between melted and sintered zones in the ingot. In an optimum condition, it is possible to obtain a high-purity niobium with gas impurities of less than 200 ppm and the hardness of 50 VHN.View full abstractDownload PDF (1176K) -
Masayoshi Kaba, Takashi Ishida, Hiroki Yokoyama1965 Volume 29 Issue 10 Pages 931-934
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSIn this report, changes in the austenizing temperature and the Ms point of a high carbon steel containing 1.25% carbon after different degrees of heating to the austenizing temperatures have been investigated using a recording dilatometer and an electron microscope. The specimens were preliminarily heat treated to give them various structures: spheroidized cementite, coarse pearlite, semi spheroidize cementite, and normalized and as hot-rolled structures. In the experiment, the specimens were rapidly and slowly heated, followed by rapid quenching in water. Then the rates of transformation were obtained by means of the recording dilatometer. The results were as follows: (1) The biginning temperature of austenitization and the Ms-point were the lowest in the case of the normalized structure, and followed in the order of speroidized cementite, semi-speroidized cementite and coarse pearlite. (2) The beginning temperature of austenitization lowered with decreasing of the heating rate. (3) The solubility of carbon in ferrite affects the time to under the influence of carbon solution in complete the austenitizing. (4) The Ms temperature was in the range of about 230°∼240°C, but that of the specimen as hot-rolled was 190°C. The Ms temperature seems to depend on the carbon content of austenite.View full abstractDownload PDF (669K) -
Masanobu Miyake, Michio Iseki, Tadao Sano1965 Volume 29 Issue 10 Pages 935-940
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSA kinetic study has been made on the dissolution process of Cu-44.0Ni, Cu-23.8Ni and Cu-11.9Ni alloys in liquid Bi. The measurements of solution rate were carried out under a static and isothermal condition at 400°, 450° and 500°C.
The results showed that the dissolution process for the Cu- and Ni-components followed approximately a modified Nernst-Brunner’s equation which was introduced by assuming that each component of the alloys has a solution rate constant corresponding to the alloy composition and dissolves homogeneously. It was also deduced that the rates of dissolution would be determined by the diffusion process of dissolved atoms through the boundary layer adjacent to the dissolving surface of the alloy. At each temperature, the values of solution rate constants obtained for the Cu- and Ni-components of the alloys increased with the increase in Ni-contents of the alloys. On the other hand, these values for each alloy increased linealy with the increase in the product of saturation concentrations of Cu and Ni in Bi. It was also found that, independent of temperature and the kind of alloys, there was a linear relationship between the solution rate constants and the ratios of the saturation concentration of Ni to those of Cu in Bi. In addition to this, the measured values of activation energy for dissolution of Cu- and Ni-components were almost equivalent in the alloys.
From these facts, it was assumed that there are the strong mutual interaction between Cu and Ni atoms in dissolution process which promotes a cooperative dissolution of these alloy components.View full abstractDownload PDF (1078K) -
Kaizo Monma, Hajime Suto, Hideo Ogita1965 Volume 29 Issue 10 Pages 941-947
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSIn a previous paper, it was described that the role of chemical interaction between interstitial atoms and substitutional atoms (I-S effect) on the strength at elevated temperature of low alloy steels was important. In this paper, the experimental results on the mechanism of I-S effect are discussed. Iron-chromium and iron-molybdenum alloys were used as specimens, and the effects of alloying elements on the relationships between grain size and lower yield point, and on the strain aging, delayed yielding time and the Portevin-Le Chatelier phenomenon were observed. Based upon these experiments, it was assumed that the I-S effect was due to the interaction between moving dislocation and I-S atmosphere comprised of interstitial and substitutional atoms which were chemically interacted to each other.View full abstractDownload PDF (966K) -
Nobumitsu Kitashima1965 Volume 29 Issue 10 Pages 948-955
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe mechanism of cavitation damage given to the materials of hydraulic machines differs according to the magnitude of impact force working on the material surface during the collapse of cavities. It is generally considered that when the impact force is small, an electro-chemical action is the main factor of the damage. But, when the impact force is large, mechanical destruction predominates. Therefore, in a study of cavitation-proof materials, the following should be borne in mind: (a) to grasp the main cause of the damage object. (b) to study under the same condition as the impact object.
In the cavitation damage regions of the pump which rotates at a relatively high speed, the author observed that the slip of crystal and the work hardning stratum existed in the damaged regions of the bronze casting impeller, but that none of them existed in the 13%Cr steel casting impeller used under the same cavitation condition and the wedge-shaped cracks were observed. From this example, it was concidered that mechanical destructive force that acted on the damage regions by cavitation would be larger than the critical shearing force of bronze crystal and smaller than that of 13% Cr steel. The slip of crystal and the work hardening layer were also found in the damaged 18-8 stainless steel pump parts. In the above examples, the mechanical destructive force on the damaged regions cannot be ignored. Next, by giving cavitation to the speciemens produced from a similar material to that in the examples, the work hardening stratum generated on the damage part of the specimens were compared with that in the damaged regions of the examples. The result showed that the destructive force that acted in the vicinity of the center of damage regions of the examples would be the same as or a little larger than that acted on the specimen with cavitation generated by the magnetostrictive method at the amplitude of 62μ.View full abstractDownload PDF (1197K) -
Nobumitsu Kitashima1965 Volume 29 Issue 10 Pages 955-961
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSIn a previous report, it has been mentioned that the slip of crystal and the work hardned stratun exists on the service-damaged regions of bronze or 18-8 stainless steel structual materials for pumps, but that none of them exists in the 13%Cr steel and wedge-shaped cracks were observed. From this, it was considered that the cavitation damage was affected by crystal structure af materials. In order to make clear this problem, experiments on B.C.C. materials were performed.
From the experimental results obtained for pure iron specimens, the magnitude of the mechanical destructive force that acted on the damaged regions of pump structual materials was determined, with the following results:
(1) Wedge-shaped cracks are observed in the damaged regions. As a result of the microhardness test, the work hardening stratum is scarcely seen.
(2) The cracks are predominantly transglanular, and they seem to stop when the edge of thes cracks reached the grain boundary.
(3) With regared to the crystal grain sizes of materials, the rough grains are suffered greater damage than the fine grains.
(4) The mechanism of cavitation damage is similar to that of fatigue destruction.
(5) From the experimental results of pure iron specimens, it is considered that the mechanical destructive force on the damaged regions of pump structual materials are a little over 17 kg/mm2.View full abstractDownload PDF (1023K) -
Kazuhisa Okajima, Robert D. Pehlke1965 Volume 29 Issue 10 Pages 961-965
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe influence of tin on the activity of zinc in molten lead has been measured, using a galvanic cell with a liquid chloride electrolyte in the temperature range of 450°∼650°C.
The activity of zinc in the lead-zinc binary alloy is known to be in good agreement with Henry’s Law. The activity coefficient of zinc in lead is large and positive, and is decreased by the presence of small amounts of tin. The results may be expressed in terms of the following interaction parameters:
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Masataka Sugiyama, Hisashi Suzuki, Takaharu Yamamoto, Akio Hara, Hitos ...1965 Volume 29 Issue 10 Pages 965-969
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSWC-TaC-10%Co alloys containing 0.5, 1.0, 3.0%TaC (added in the form of a mixed carbide) and having various carbon contents were vacuum-sintered at 1375°C for 2 hr. The particle size of the WC powder used was controlled to obtain an approximately same grain size of carbides in the sintered alloys. Some properties of the as-sintered alloys and the effect of low-temperature annealing (at 800°C up to 50 hr) on them were studied as a function of the TaC and carbon contents, using the experimental method as used in previous investigations(1)∼(4).
The main results are as follows: (1) The relations(1)∼(4) recently obtained by the authors on sintered WC-Co straight alloys, namely, that the properties of two phase alloys are remarkably influenced by their carbon contents and also by low temperature annealing when the carbon contents are lower, are substantially maintained in the alloys containing TaC. (2) The composition of binder phase, width and position in the two phase range (a γ+TaC+WC three phase range) of the WC-TaC-10%Co alloys do not change by the addition of TaC. (3) The alloys containing TaC are higher in hardness than the straight alloys, but the strength scarcely decreases. (4) The aging rate at a low temperature is retarded in the alloys containing TaC.View full abstractDownload PDF (649K) -
Hisashi Suzuki, Masataka Sugiyama, Kozi Hayashi1965 Volume 29 Issue 10 Pages 970-974
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSWC-10%Co alloy and two series of WC-TiC-10%Co alloys with 0.64 and 1.28%TiC, having various carbon contents in the phase range free from the η and graphite phase, were vacuum-sintered mainly at 1375°C for 1.5 hr. Effects of the TiC addition to the sintered WC-10%Co alloys on their properties and, moreover, on their binder phase were studied, in details by measuring their density, lattice constant of the binder phase, relative magnetic saturation, hardness, transverse-rupture strength, grain size of WC, etc..
The experimental results obtained are as follows. (1) The variation of general properties of the TiC containing alloys, due to a small change of the carbon content, is equal to that of straight WC-Co alloys(2)(4) as reported previously. (2) The value of magnetic saturation of the alloys and the lattice constant of the binder phase which are changeable according to their carbon content are also identical with the straight alloys. From this and the formation of the WC-TiC solid solution by the 0.15%TiC addition, it may be concluded that TiC is hardly soluble in the binder phase. In this respect, the behaivior of TiC is almost similar to that of TaC. (3) The width of the γ+ carbides range and the position of the stoichiometric carbon content in that range are in good agreement with those of the straight alloys. (4) It can be predicted that the addition of a small amount of TiC to the WC-Co alloys inhibits the recrystallization of the carbide phase, and consequently the alloys have finer WC grains and higher hardness than the corresponding alloys of TiC free compositions. Because of this finer structure, the rate of precipitation of the Co3W type compound from the binder phase is accelerated when the low carbon alloys are annealed at low temperatures. (5) The TiC addition makes the η-phase grain finer and improves its dispersion, so that the strength of the alloys even under the appearance of then phase dces not decrease abruptly.View full abstractDownload PDF (993K) -
Hisashi Suzuki, Masataka Sugiyama, Takateru Umeda1965 Volume 29 Issue 10 Pages 974-979
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSIt has been reported that the composition of the binder-phase of two phase alloys changes remarkably from about 2∼3% to 9∼10%W due to a small change of their carbon content, so that the properties and the aging characteristics of cemented carbides are directly influenced by the composition. In this report, some properties of cemented carbides affected by the particle size are investigated in close consideration of the composition of the binder phase. The properties such as hardness, strength, magnetic saturation, coercive force and electrical resistivity of the alloys and the lattice parameter of binder phase, are measured.
The results obtained may be summarized as follows. (1) The value of coercive force is not only dependent upon the particle size, but also upon the tungsten content of the binder phase. Therefore, the determination of the mean particle size by a coercive force method is erroneous. (2) The hardness and electrical resistivity decrease with increasing of the particle size and the carbon content. (3) The transverse-rupture strength shows a maximum under the condition that the mean particle size is about 2.0μ and the carbon content of WC is about 6.20% which is almost the maximum carbon content of the two-phase alloy. And as a condition to obtain a maximum strength, it is generally accepted in the two-phase alloy that the carbon content should be almost maximum, if the particle size is nearly equal to or less than about 2.0μ, but in the case of a fairly coarser particle size it should be almost minimum. (4) Both the lattice constant of the binder phase and the magnetic saturation of the alloy are not influenced by the particle size of WC, that was developed after sintering. Therefore, it is clear that the tungsten content in the solid binder phase has no relation to the particle size, provided that the carbon content of the alloy is invariable. (5) But the rate of precipitation of Co3W, when low carbon alloys are annealed at low temperatures, is sensitive to the particle size. A carbide structure of coarse and homogeneous particle size is desirable to stabilize the properties of low carbon alloys at a higher temperature.View full abstractDownload PDF (766K) -
Goro Ito, Yoshihiko Shimizu, Fumio Sawayanagi1965 Volume 29 Issue 10 Pages 980-985
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSEffects of boron on the static corrosion of austenitic stainless steels in high purity water at the temperature of 320°C were studied. The addition of boron up to 1.8% markedly increased the corrosion of 18-8 stainless steels, characterized by the formation of nonadherent corrosion product film. These adverse effect of boron can be attributed to the impoverishment of chromium in the matrix of steels caused by the formation of chromium rich boride which is reported as the type of (Fe, Cr)2B. The addition of about 2∼3% titanium to the steel containing boron can improve in some measure the corrosion resistance, because a part of boron forms titanium boride and hence the amount of chromium migrating from the matrix to the boride can be decreased. It is anticipated that the impoverishment site of chromium in the matrix may result in the instability of austenite and cause the formation of ferrite. The amount of ferrite defected in the boron stainless steel by magnetic analysis was about 5% of austenite. Microscopic examination of the steels after a short time corrosion test in high temperature water showed that the matrix and titanium boride corroded much faster than chromium and iron boride. The welding tests of the stainless steels containing boron were also conducted by using the innert gas arc process. It was revealed that the welding did not affect the corrosion resistance, and this result may be attributed to the stability of the microstructure of the steels to welding.View full abstractDownload PDF (864K) -
Sueo Nomura, Noboru Ito1965 Volume 29 Issue 10 Pages 985-990
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSPure lead (99.99%Pb) was corroded in pure water at 30°, 50°, 80° and 100°C and under various atmospheric conditions such as open air, de-carbonated air bubbling and nitrogen gas bubbling. A sample coupon was polished by nitric acid before test and immersed in pure water renewed everyday.
Corrosion was mainly controlled by the dissolved oxygen in the water by which PbO was produced and dissolved into the water. The weight loss of a sample was represented by the linear function with time in the temperature range of 30°∼80°C except nitrogen gas bubbling.
Under open air, the corrosion rate was controlled by the diffusion of the dissolved oxygen, and a large amount of silver white precipitation (2PbCO3Pb(OH)2) was found in the reaction vessel.
When de-carbonated air bubbling, the amount of corrosion was determined by the solubility of PbO and/or the renewal frequency of the water. The yellowish brown scale mainly consisted of PbO was found on the metal surface.
There was little corrosion at 100°C or when nitrogen gas bubbling, and this is probably due to the lack of dissolved oxygen.
The Cl− and SO4− ions in the water have shown a deleterious and a inhibitive effect on corrosion respectively, and in a dilute NaOH solution the corrosion of lead was largely inhibited.View full abstractDownload PDF (841K) -
Tadayuki Nakayama, Hisao Fujikawa1965 Volume 29 Issue 10 Pages 990-995
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe present authors studied oxidation behaviours of 0.008∼0.470 wt%Ce-Fe alloys in air at high temperatures (800°C, 3 hr; 1000°C, 2 hr), particularly the oxide layers produced on them under the same oxidation conditions, using the thermo-balance, X-ray probe microanalyzer, X-ray diffraction and optical microscopic methods. The main results obtained are as follows: (1) It was verified by the X-ray probe microanalyzer measurments that the Ce concentration was enriched along the inner oxide layer being in contact with the surface of the 0.025 wt%Ce-Fe alloy which was oxidized at 800°C for 3 hr. At the higher temperature (1000°C, 2 hr), the 0.470 wt%Ce-Fe alloy was covered with the thick oxide layer of high Ce concentration. (2) The X-ray diffraction patterns obtained from inner oxide layers of the alloys containing Ce more than 0.292 wt% after the oxidation at 800°C for 3 hr showed the existence of the CeFeO3 phase (perovskite type, pseudo cubic: a0=3.915 Å), besides iron oxides. CeFeO3 and CeO2 crystals were also detected from inner oxide layers produced on the alloys containing Ce more than 0.232 wt% by the higher temperature oxidation (1000°C, 2 hr). (3) CeFeO3 crystals were not produced by sintering butches of α-Fe2O3-CeO2 and Fe3O4-CeO2 mixtures in vacuum (ca. 10−3 mmHg) at the same temperatures as used for the oxidation experiments of Fe-Ce alloys and at 1200°C for 24 hr. CeFeO3 crystals, however, were observed by the X-ray diffraction method, when the butch of the FeO-CeO2 mixture was sintered under the same conditions. Therefore, it should be reasonable to consider that the formation mechanism of CeFeO3 crystals detected from the inner oxide layer of Fe-Ce alloys depends on the solid reaction of FeO and CeO2 crystals at high temperatures.View full abstractDownload PDF (1054K) -
Toshio Saitô, Syôichi Murakami1965 Volume 29 Issue 10 Pages 995-1001
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSIn order to shorten the annealing time of some hardenable steels, the anneal treatments that comprise proper working in the annealing process were studied. Firstly, the effects of plastic deformation at various temperature on the spheroidization of three kinds of commercial carbon steels (0.44, 0.82 and 1.23%C) were investigated by microscopic observation and hardness measurement. Results obtained were as follows:
(1) All the steels, deformed above the 13% working ratio at the highest heating temperature and then thermal cyclic treated, showed a slightly lower constant hardness and a better spheroidized structure than those without working.
(2) The steels, 13% deformed over the metastable austenitic temperature range and then thermal cyclic treated, were not affected remarkably by the deforming temperature. Only the 0.82%C steel showed a slightly lower hardness by working at 600°C. The hardness of all the steels after this treatment were comparatively higher than that of the steels worked at the highest heating temperature.
(3) All the steels, 13% deformed at room temperature and at 500°∼700°C without prior-heating at the highest heating temperature and then thermal cyclic treated, showed a lower hardness and a mixed spheroidal structure of coarse and fine cementites by working at 600°C.
Particularly, the 0.44%C steel showed a better spheroidized structure than that obtained by any other methods.View full abstractDownload PDF (974K) -
Toshisada Mori, Eiji Ichise1965 Volume 29 Issue 10 Pages 1001-1005
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe effects of arsenic and copper on the solubility of nitrogen in austenite were measured by the use of quenching method. The measurements were performed within the austenitic range; the experimental temperatures were 1250°, 1150° and 1050°C and the concentrations of arsenic and copper were up to 1.5% and 2.5%, respectively. The interaction parameters were determined as follows;
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The relationship between the interaction parameters and the atomic number of alloying elements and the temperature dependence of interaction parameters were also discussed. The curve showing relationship between the interaction parameters and the atomic number of the elements belonging to the 1st long period rises monotonously from V to Fe, having a plateau at the position of Co or Ni, and then drops at the position of Cu. And it rises again to the value at the position of As which may be expected from the monotonous increase. The behavior of the curve from Cu to As remains unknown because of the lack of data available on Zn, Ga and Ge.
Temperature dependence of the nitrogen solubility in γ-iron can be expressed as follows:
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This is the regression line of log[%N] with respect to 1⁄T determined from 124 data in a series of the authers’ experiments under one atmosphere of nitrogen.View full abstractDownload PDF (499K) -
Isao Gokyu, Yoshihiro Saito1965 Volume 29 Issue 10 Pages 1005-1012
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe contact pressure distributions in the box-pass-rolling of commercial pure aluminum square bars were measured by the contact-pin method. The data obtained were compared with those in the flat rolling. The results can be summarized as follows:
(1) The pressure distributions along the arc-of-contacts in these two kinds of rolling have a similar shape; i.e., near the entry into rollgap there is a maximum peak, the height of which is nearly twice the flow stress, while in the other region the pressure has almost the same magnitude as the flow stress.
(2) The difference between box-pass-rolling and flat-rolling is that the contact pressure observed in the box-pass-rolling is 10∼20% higher than that in the flat-rolling.
(3) The shape of the elastic-plastic boundary was determined to estimate the pressure distribution according to a method proposed by MacGregor and Palme. Good agreement could not be obtained between the estimated pressure distribution and that observed in the present investigation.View full abstractDownload PDF (1046K) -
Takeo Sata1965 Volume 29 Issue 10 Pages 1012-1013
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSDownload PDF (199K) -
1965 Volume 29 Issue 10 Pages 1013
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSPlease see pdf. Wrong:[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japanese] Right:[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japanese]View full abstractDownload PDF (27K)
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